<template>
  <table v-if="treeData.name">
    <tr>
      <td
        :colspan="treeData.children ? treeData.children.length * 2 : 1"
        :class="{parentLevel: treeData.children, extend: treeData.children && treeData.extend}">
        <div :class="{node: true, hasMate: treeData.mate}">
          <div
            v-if="treeData.mate"
            class="person"
            @click="$emit('click-node', treeData.mate)">
            <div class="name">{{ treeData.mate.name }}</div>
          </div>
          <div
            class="person"
            @click="$emit('click-node', treeData)">
            <div class="name">{{ treeData.name }}</div>
          </div>
        </div>
        <div
          v-if="treeData.children"
          class="extend_handle"
          @click="toggleExtend(treeData)"/>
      </td>
    </tr>
    <tr v-if="treeData.children && treeData.extend">
      <td
        v-for="(children, index) in treeData.children"
        :key="index"
        colspan="2"
        class="childLevel">
        <TreeChart
          :json="children"
          @click-node="$emit('click-node', $event)" />
      </td>
    </tr>
  </table>
</template>

<script>
export default {
  name: 'TreeChart',
  props: {
    json: {
      type: Object,
      required: true
    }
  },
  data() {
    return {
      treeData: {}
    }
  },
  watch: {
    json: {
      handler: function(Props) {
        const extendKey = function(jsonData) {
          jsonData.extend = (jsonData.extend === void 0 ? true : !!jsonData.extend)
          if (Array.isArray(jsonData.children)) {
            jsonData.children.forEach(c => {
              extendKey(c)
            })
          }
          return jsonData
        }
        if (Props) {
          this.treeData = extendKey(Props)
        }
      },
      immediate: true
    }
  },
  methods: {
    toggleExtend: function(treeData) {
      treeData.extend = !treeData.extend
      this.$forceUpdate()
    }
  }
}
</script>

<style scoped>
table {
  border-collapse: separate !important;
  border-spacing: 0 !important;
}
td {
  position: relative;
  vertical-align: top;
  padding: 0 0 50px 0;
  text-align: center;
}

.extend_handle {
  position: absolute;
  left: 50%;
  bottom: 30px;
  width: 10px;
  height: 10px;
  padding: 10px;
  transform: translate3d(-15px, 0, 0);
  cursor: pointer;
}
.extend_handle:before {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  border: 2px solid;
  border-color: #ccc #ccc transparent transparent;
  transform: rotateZ(135deg);
  transform-origin: 50% 50% 0;
  transition: transform ease 300ms;
}
.extend_handle:hover:before {
  border-color: #333 #333 transparent transparent;
}
.extend .extend_handle:before {
  transform: rotateZ(-45deg);
}

.extend::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 15px;
  height: 15px;
  border-left: 2px solid #ccc;
  transform: translate3d(-1px, 0, 0);
}
.childLevel::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 100%;
  height: 15px;
  border-left: 2px solid #ccc;
  transform: translate3d(-1px, 0, 0);
}
.childLevel::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -15px;
  border-top: 2px solid #ccc;
}
.childLevel:first-child:before,
.childLevel:last-child:before {
  display: none;
}
.childLevel:first-child:after {
  left: 50%;
  height: 15px;
  border: 2px solid;
  border-color: #ccc transparent transparent #ccc;
  border-radius: 6px 0 0 0;
  transform: translate3d(1px, 0, 0);
}
.childLevel:last-child:after {
  right: 50%;
  height: 15px;
  border: 2px solid;
  border-color: #ccc #ccc transparent transparent;
  border-radius: 0 6px 0 0;
  transform: translate3d(-1px, 0, 0);
}
.childLevel:first-child.childLevel:last-child::after {
  left: auto;
  border-radius: 0;
  border-color: transparent #ccc transparent transparent;
  transform: translate3d(1px, 0, 0);
}

.node {
  position: relative;
  display: inline-block;
  width: 8em;
  box-sizing: border-box;
  text-align: center;
}
.node .person {
  position: relative;
  vertical-align: text-top;
  display: inline-block;
  z-index: 2;
  width: 3em;
  overflow: hidden;
}
.node .person .name {
  height: 6em;
  font-family: "微软雅黑";
  font-size: 16px;
  letter-spacing: 0.2em;
  line-height: 3em;
  writing-mode: tb-rl;
  overflow: hidden;
  width: 100%;
}
.node.hasMate::after {
  content: "";
  position: absolute;
  left: 2em;
  right: 2em;
  top: 0.5em;
  border-top: 2px solid #ccc;
  z-index: 1;
}
.node.hasMate .person:last-child {
  margin-left: 1em;
}

.landscape {
  transform: translate(-100%, 0) rotate(-90deg);
  transform-origin: 100% 0;
}
.landscape .node {
  text-align: left;
  height: 8em;
  width: 8em;
}
.landscape .person {
  position: relative;
  transform: rotate(90deg);
  padding-left: 4.5em;
  height: 4em;
  top: 4em;
  left: -1em;
}
.landscape .person .avat {
  position: absolute;
  left: 0;
}
.landscape .person .name {
  height: 4em;
  line-height: 4em;
}
.landscape .hasMate {
  position: relative;
}
.landscape .hasMate .person {
  position: absolute;
}
.landscape .hasMate .person:first-child {
  left: auto;
  right: -4em;
}
.landscape .hasMate .person:last-child {
  left: -4em;
  margin-left: 0;
}
</style>
